Lock



Feb. 18, 1936. J. w. FlTZ GERALD ZfiMJEE LOCK Fil ed June 7, 1935 /6 /7 M a/3' M Y Patented Feb. 18, 1936 UNITED STATES,

PATENT OFFICE v LOCK John W. Fitz Gerald, Milwaukee, Wis-., assignor to Briggs & Stratton Corporation, Milwaukee,

Wis, a corporation of Delaware,

Application June 7, 1935, Serial No. 25,448

12 Claims" (Cl. 70-46) This invention relates to improvements inlocks and has as an object to provide means operable upon the application of endwise force on the lock cylinder, as during an attempt at unauthorized manipulation of the lock, for positively rendering:

the lock inoperative.

Another object of this invention is to: providea lock structure wherein the lock cylinder is held against inward axial movement by a strong spring;

-- A further object of this invention is to provide automatically operable locking means fordestroymg: the operativeness of a lock, particularly of the type known as steering column locks and shown in the co-pending application of John Fitz: Gerald, Serial No. 756,630; filed December 8th, 1934, upon the application of endwise movement to the lock cylinder as in an attempt at;

unauthorized manipulation of theilock;

Withthe above and other objects in View which will appear as the description proceeds, this: invention resides in the novel construction, combination and arrangement of parts substantially" asv hereinafter described and more particularly defined by the appended; claims, it being understood that such changes in the precise embodi ment of the hereindisclosed invention may be made ascome Within the scope of the claims.

The accompanying drawing illustrates two complete examples of the physical embodiment of the: invention constructed according tothe best modes so far devised for the practical application of the: principles thereof, and in which:

Figure. 1a is a view partly in longitudinal section and partly in side elevation through a lock' embodying one .form of this invention;

vvFigure 2 is'a-view similar to Figure 1 showing the application of this invention to a steering post lock of the type shown in theaforesaid co pending application of John W. Fitz Gerald;

Figure 3 is asectional View through Figure'2 on theplane of theline 3-3;

Figure 4 is a detail section view through Figure- 3onthe'plane of the line l4; and- Figure 5 is a detail sectional View through Figure 4 onthe plane of the line 5--5.

Referring now more particularly to-theaccompanying drawing in which like numerals indicate like parts throughout the several views, the numeral 5 designates the casing of a conventional cylinder lock bored as at 6 to'receivea lock cylinder. The inner end of the casing is closed' by a wall 8' and to permit the transmissionof motion from the lock cylinder to mechanism to be actuated (not shown) the rear. wall- S'may beprovided: with an arcuate opening 9- through which aneccentrie cam m extends. The eccentric driving cam: 10 imaybe formed as an integral part of the cylinder 1. v

The iockcylinderis normally held in a locked position ofrotation by the projection of a locking 5 i it its side and into a longitudinal groove (mainstream) in. the casing. The locking bar H isprojectibletmita operative locking position by keyioperable tumblers (not shown) and is retraictible within: the periphery of the cylinder 1 10 upon the: insertion of a proper key (also not shown);

A heavy expansive spring li-confined between the inner end of the lock cylinder and the rear wallB of the casingyieldingly'urges the cylinder 15 forwardly the casing, To limit the forward proiectien of'the' cylinder by the-spring l2, a stop pin I3 carried by the-casing and engaging in an arcuate: groove: M2 is providedi Communicating withthe arcuate groove M isa longitudinal recess 20 or groove 45 to accommodate-thestop pin I 3 upon inward movement ofthe lock cylinder against the action of the spring l2. 7 V 7 Upon such inward'a-xial movement of the cylinder; twospringpressed-loeking pins Hi carried 25 by the cylinder are aligned with diametrically opposedlopenings l1 inthecasing, and as the pins lfialignwith the openings l1 theirspring l8 projects. them outwardly into the openings I! to positively secure the lock cylinder against further 30 actuation; The locking pins IB- are preferably encased within and projectible. from the ends of a sheath [9 secured in a transversebore 20 in the cylinderl Shoulders on thelocking pins limit their outward? projection by the spring I8. 35

In the modified embodiment of the invention shown in Figures 2.to 5, inclusive, the lock cylind'er carries no locking pins, but as in the embodi'mentshown inc-Figure 1,,itis-yieldingly urged forwardly by a. heavy expansive spring I 2'. In 40 this embodiment oi the invention, which is particularly applicable to steering post locks, the cylinder has a driving cam 2| projecting from its inner end' which. engages in a recess 22 in a looking bolt 23 slidable transversely to the axis of the 45 cylinder-and normally by rotation of the cylinder and its cam 21, the bolt 23* is retracted. Preferably; the bore 24 in which the bolt 23- slides, is formed as an integral part of the casing 5 and in a steering post lock, this casing 5 is shaped to 50 embracethe post, as is well known.

Qner end Zion the'locking bolt is'projectible as bestshown inliigure'ii; into operative engagement with the part to be locked. A spring 26 confined between the opposite end of the bolt: and a plate 55 21 closing he adjacent end of the bore 24 yieldingly projects the locking bolt to its operative position from which it is retractible by rotation of the lock cylinder through the medium of the driving cam 2|.

It will be noted that a pin 28 projects from the end wall 29 of the recess 22 with which the driving cam 2i engages and that the driving cam 2| has a notch 30 hooked over this pin. This provides a connection between the lock cylinder and the locking bolt through which endwise movement of the lock cylinder when in its locked position, as shown in Figures 2 and 3, is translated into rotation on the part of the locking bolt 23. Upon such rotation of the locking bolt, lockingpins 3| similar to the pins l6 but carried by the locking bolt will be brought into alignment with openings 32. 2 p

The locking pins 3| like the pins I6 are mounted in a sheath 33 which likewise encloses the spring 34 which serves to yieldingly pro'jectthe pins into the openings 32 upon being brought into align-' ment therewith. V

Inasmuch as the notch 30 in the driving camll disengages the pin 28 during normal manipulation of the lock, it is necessary to'hold the locking bolt against possible turning during this period and for this purpose, the bore 24 in which the bolt slides has diametrically opposite longitudinal grooves 35. These grooves 35 are shallow and round bottomed and the ends of the locking pins are likewise rounded so that a slight turning force applied to the locking bolt serves to disengage the pins therefrom. I

From the foregoing description taken in connection with the accompanying drawing, it will be readily apparent to those skilled in the'art, that this invention afiords simple means for positively rendering a lock inoperative upon the application of endwise force on the cylinder as in an attempt at unauthorized manipulation of the lock, and that this invention is particularly applicable to steering post locks.

What I claim as my invention is:

1. In a look, a casing, a lock cylinder mounted therein, yieldable spring means holding the lock cylinder in a normal position of endwise movement, said spring means permitting a degree of inward endwise movement upon the application of inward force on the cylinder, and means for positively rendering the lock inoperative upon inward endwise movement of the cylinder a predetermined distance.

2. In a lock including a casing and a lock cyll inder therein, a spring yieldingly urging the lock cylinder outwardly of the casing, and locking means to destroy the operativeness of the look upon forced inward axial movement of the lock.

cylinder against the action of the spring as in an attempt at unauthorized manipulation of the lock.

3. In a lock including a casing and a lock cylinder therein, a spring yieldingly urging the lock cylinder outwardly of the casing, and means to positively render the lock inoperative upon forced inward axial movement of the lock cylinder against the action of the spring, said means comprising a part movable to a predetermined position with repect to the casing upon inward endwise movement of the lock cylinder against the action of the spring, and means for projecting said part, into interlocking engagement with the casing upon being moved to said predetermined position.

4. In a lock including a casing and a lock cylof the spring comprising a spring pressed locking pin carried by the cylinder and projectible into a locking recess in the casing upon inward endwise movement of the cylinder a predetermined distance.

'6. In a lock including a casing and a lock cylinder therein, spring means yieldingly holding the cylinder in a predetermined position of endwise movement, and means to positively render the lock inoperable comprising a spring pressed locking pin carried by the lock cylinder and projectible into a locking recess in the casing upon endwise movement of the cylinder out of its normal position against the action of said spring means.

'7. In a lock including a casing and a lock cylinder therein, spring means yieldingly maintaining the lock cylinder in a predetermined position of endwise movement in the casing, and means to positively render the lock inoperable comprising a spring pressed uocking pin bodily movable with the lock cylinder into engagement with a locking recess upon endwise movement of the cylinder against the action of said spring means as in an attempt at unauthorized manipulation of the lock.

8. In a look, a casing, a locking bolt slidable and rotatable in the casing, a lock cylinder rotatable and slidable in the casing, a connection between the cylinder and locking bolt for sliding the bolt axially upon rotation of the cylinder and for turning the bolt upon endwise movement of the cylinder, means for holding the cylinder against endwise movement, said means being of insufficient strength to hold the cylinder against endwise movement in the event of the application of excessive force thereto as in an unauthorized attempt to manipulate the lock, and means operable upon turning of the locking bolt as a result of such forced endwise movement of the cylinder for positively rendering the lock inoperative.

9. In a look, a casing, a locking bolt mounted in the casin, a lock cylinder mounted in the casing a driving connection between the lock cylinder and the locking bolt whereby rotation of the cylinder actuates the bolt in the performance its normal locking function, means for holding the lock cylinder in a normal position of endwise movement, a connection between the cylinder and locking bolt whereby endwise movement of the lock cylinder turns the locking bolt, and cooperating locking means carried by the bolt and casing operable to secure the bolt against further actuation upon a predetermined rotation of the bolt as a result of endwise movement of the lock cylinder as in an attempt at forced manipulation of the lock.

10. In a look, a casing having intersecting bores, a lock cylinder slidable and rotatable in one bore, a locking bolt slidable and rotatable in the other bore, a connection between the lock cylinder and the locking bolt whereby rotation of the cylinder transmits sliding movement to the locking bolt to effect the normal locking function of the bolt and axial sliding of the cylinder turns the locking bolt, spring means yieldingly maintaining the lock cylinder in a predetermined position of endwise movement, said spring means being of suflicient strength to normally hold the cylinder in said predetermined position of endwise movement but having insuificient strength to withstand an excessive force on the lock cylinder in an endwise direction, and cooperating means carried by the locking bolt and the casing operable upon turning of the bolt as a result of endwise movement of the lock cylinder for positively securing the locking bolt against actuation in any direction.

11. In a lock, a casing having intersecting bores, a locking bolt rotatable and slidable in one bore, a lock cylinder rotatable and slidable in the other bore, a connection between the cylinder and bolt whereby rotation of the cylinder is translated into sliding movement of the bolt and endwise movement of the cylinder is translated into rotation of the bolt, a spring yieldingly urging the lock cylinder outwardly of the casing, and a spring pressed locking pin carried by the locking bolt and projectible into a locking recess in the casing upon rotation of the bolt a predetermined degree as a result of inward endwise movement of the lock cylinder as in an unauthorized attempt at manipulation of the lock.

12. In a lock, casing having intersecting bores, a locking bolt rotatable and slidable in, one bore, a lock cylinder rotatable and slidable in the other bore, a connection between the cylinder and bolt whereby rotation of the cylinder is translated into sliding movement of the bolt, another connection between the cylinder and bolt whereby endwise movement of the cylinder is translated into rotation of the bolt, said latter connection being broken upon rotation of the cylinder to eflect sliding movement of the bolt, means for yieldingly holding the bolt in a predetermined position of rotation to. insure re-establishment of said second connection, means for yieldingly maintaining the cylinder against endwise movement, and means operable upon rotation of the bolt caused by endwise movement of the cylinder for positively locking the bolt against further actuation.

JOHN W. FITZ GERALD. 

